Quantum-Information Processing with Hybrid Spin-Photon Qubit Encoding

TL;DR

This paper proposes a hybrid spin-photon qubit encoding scheme for quantum information processing, utilizing resonator frequency shifts and auxiliary cavities for gate operations, applicable to various spin systems.

Contribution

It introduces a novel hybrid encoding scheme and a fast, resonance-based method for quantum gates, including two-qubit operations with auxiliary cavities.

Findings

Single-qubit gates achieved via resonance frequency shifts

Two-qubit gates implemented using an auxiliary cavity

Scheme applicable to a wide range of spin systems

Abstract

We introduce a scheme to perform quantum-information processing that is based on a hybrid spin-photon qubit encoding. The proposed qubits consist of spin-ensembles coherently coupled to microwave photons in coplanar waveguide resonators. The quantum gates are performed solely by shifting the resonance frequencies of the resonators on a ns timescale. An additional cavity containing a Cooper-pair box is exploited as an auxiliary degree of freedom to implement two-qubit gates. The generality of the scheme allows its potential implementation with a wide class of spin systems.